\begin{table}%t9
\caption {\label{errpar}Uncertanties due to the choice of stellar parameters for the coolest
(second column) and the warmest (third column) of our programs stars (see
Sect.~\ref{sec-err2}).}                  
%\centerline
 {          
\begin{tabular}{l c c c}     
\hline\hline    
\noalign{\smallskip}   
Ratio & NGC 2099-508  & Cr110-2129 & Average \\
      & ($T=4500$~K) & ($T=4950$~K) & \\
%        & & & \\
\hline      
$[$Al/Fe$]$   & $\pm$0.04 & $\pm$0.07 & $\pm$0.05 \\
$[$Ba/Fe$]$   & $\pm$0.04 & $\pm$0.08 & $\pm$0.06 \\
$[$Ca/Fe$]$   & $\pm$0.03 & $\pm$0.03 & $\pm$0.03 \\
$[$Co/Fe$]$   & $\pm$0.07 & $\pm$0.05 & $\pm$0.06 \\
$[$Cr/Fe$]$   & $\pm$0.09 & $\pm$0.03 & $\pm$0.06 \\
$[$Fe/H$]$    & $\pm$0.16 & $\pm$0.04 & $\pm$0.10 \\
$[$La/Fe$]$   & $\pm$0.10 & $\pm$0.07 & $\pm$0.09 \\
$[$Mg/Fe$]$   & $\pm$0.11 & $\pm$0.09 & $\pm$0.10 \\
$[$Na/Fe$]$   & $\pm$0.03 & $\pm$0.06 & $\pm$0.04 \\
$[$Nd/Fe$]$   & $\pm$0.09 & $\pm$0.12 & $\pm$0.10 \\
$[$Ni/Fe$]$   & $\pm$0.02 & $\pm$0.03 & $\pm$0.03 \\	    
$[$O/Fe$]$    & $\pm$0.10 & $\pm$0.07 & $\pm$0.08 \\
$[$Sc/Fe$]$   & $\pm$0.07 & $\pm$0.09 & $\pm$0.08 \\
$[$Si/Fe$]$   & $\pm$0.12 & $\pm$0.03 & $\pm$0.07 \\
$[$Ti/Fe$]$   & $\pm$0.07 & $\pm$0.06 & $\pm$0.06 \\
$[$V/Fe$]$    & $\pm$0.21 & $\pm$0.07 & $\pm$0.14 \\
$[$Y/Fe$]$    & $\pm$0.15 & $\pm$0.08 & $\pm$0.12 \\		                
\hline            
\end{tabular}}
\tablefoot {The average between these two extreme cases (fourth
column) is our estimate of the uncertainty due to our choice of stellar
parameters.}
\end{table}